This free app guides users through the Norwegian 4x4 interval training protocol to improve cardio and VO2 Max. It supports various cardio activities and allows for customization of interval durations and repetitions.



249+ iOS apps & games curated and reviewed
Out of 249+ norwegian 4x4 timer apps and games on iOS, 20 are free and the rest sit in the paid tier. This page sorts them so you can compare both sides before you commit.
| # | App | Price | Rating | Ads | In-App Purchases | Updated | |
|---|---|---|---|---|---|---|---|
| 1 | Free | 5.0★ (4) | No | No | Oct 2026 | ||
| 2 | Free | 5.0★ (1) | Yes | Yes | Oct 2026 | ||
| 3 | Free | 4.6★ (66) | No | Yes | Oct 2026 | ||
| 4 | Free | 5.0★ (4) | No | Yes | Oct 2026 | ||
| 5 | Free | 5.0★ (1) | No | No | Jun 2026 | ||
| 6 | Free | 3.2★ (10) | No | No | Oct 2026 | ||
| 7 | Free | — | No | No | Oct 2026 | ||
| 8 | Free | — | — | No | Jul 2026 |



This free app guides users through the Norwegian 4x4 interval training protocol to improve cardio and VO2 Max. It supports various cardio activities and allows for customization of interval durations and repetitions.





This interval training app guides you through the Norwegian 4x4 protocol or allows you to create custom workout routines. It offers audio cues, haptic feedback, and music integration to enhance your training sessions. Track your progress with workout history and unlock achievements.




This app guides you through the Norwegian 4x4 interval training protocol to improve your VO2 max and cardiovascular fitness. It offers customizable warm-up and cooldown durations, voice guidance for intervals, and integrates with Apple Watch for heart rate and calorie tracking.